Texas CDL Class B Quiz Questions with Correct Answers and Answers
with Verified Solutions | Latest 2026 Update
Q: What can happen if you do not have enough weight on the front axle?
Answer:
It can make the steering axel too light to steer safely. What is the minimum number
of tiedowns for any flat bed load? Two What is the minimum number of tiedowns for
a 20-foot load? Two (one for every 10 foot of load) Name two basic reasons for
covering cargo on an open bed. To protect people from spilled cargo and the cargo
from weather. What must you check before transporting a sealed load? Check that
you do not exceed gross weight and axel weight limits. Why must air tanks be
drained? The air tanks can have water and compressor oil in it that will freeze when
in cold weather and cause brake failure. What is a supply pressure gauge used for? It
shows how much air pressure you have in your tank. All vehicles with air brakes
must have a low air pressure warning signal. True or False? TRUE What are spring
brakes? Spring brakes are a backup braking system for the air brakes. If there is a
leak in the tank the spring will automatically come on. Front wheel brakes are good
for under all conditions. True or False? TRUE
, Q: How do you know if your vehicle is equipped with antilock brakes?
Answer:
If the vehicle was manufactured on or after March 1, 1998. What is a dual air brake
system? It has two separate air brake systems, which use a single set of brake
controls. Each system has its own air tanks, hoses, lines, etc. One system typically
operates the regular brakes on the rear axle or axles. The other system operates the
regular brakes on the front axle (and possibly one rear axle). Both systems supply air
to the trailer (if there is one). The first system is called the "primary" system. The
other is called the "secondary" system. What are the slack adjusters? They are what
determine how hard you have to press on the brakes to have them engage. How can
you check slack adjusters? Use gloves and pull hard on the slack adjuster, if the slack
adjuster moves more than an inch, it needs adjusting. How can you test the low
pressure warning signal? Shut the engine off when you have enough air pressure so
that the low pressure warning signal is not on. Turn the electrical power on and step
on and off the brake pedal to reduce air tank pressure. The low air pressure warning
signal must come on before the pressure drops to less than 60 psi in the tank (or tank
with the lowest air pressure, in dual air systems). How can you check that the spring
brakes come on automatically? Continue to fan off the air pressure by stepping on
and off the brake pedal to reduce tank pressure. The tractor protection valve and
parking brake valve should close (pop out) on a tractor-trailer combination and single
vehicle types when the air pressure falls to the manufacturer's specification (20-40
psi). This will cause the spring brakes to come on. What are the maximum leakage
rates? 2 psi in a minute for single vehicles and 3 psi in a minute for combination
vehicles. When applying 90 or more psi to the brakes the loss should be 3 psi per
minute in single vehicles and 4 psi for combination vehicles in a minute.
with Verified Solutions | Latest 2026 Update
Q: What can happen if you do not have enough weight on the front axle?
Answer:
It can make the steering axel too light to steer safely. What is the minimum number
of tiedowns for any flat bed load? Two What is the minimum number of tiedowns for
a 20-foot load? Two (one for every 10 foot of load) Name two basic reasons for
covering cargo on an open bed. To protect people from spilled cargo and the cargo
from weather. What must you check before transporting a sealed load? Check that
you do not exceed gross weight and axel weight limits. Why must air tanks be
drained? The air tanks can have water and compressor oil in it that will freeze when
in cold weather and cause brake failure. What is a supply pressure gauge used for? It
shows how much air pressure you have in your tank. All vehicles with air brakes
must have a low air pressure warning signal. True or False? TRUE What are spring
brakes? Spring brakes are a backup braking system for the air brakes. If there is a
leak in the tank the spring will automatically come on. Front wheel brakes are good
for under all conditions. True or False? TRUE
, Q: How do you know if your vehicle is equipped with antilock brakes?
Answer:
If the vehicle was manufactured on or after March 1, 1998. What is a dual air brake
system? It has two separate air brake systems, which use a single set of brake
controls. Each system has its own air tanks, hoses, lines, etc. One system typically
operates the regular brakes on the rear axle or axles. The other system operates the
regular brakes on the front axle (and possibly one rear axle). Both systems supply air
to the trailer (if there is one). The first system is called the "primary" system. The
other is called the "secondary" system. What are the slack adjusters? They are what
determine how hard you have to press on the brakes to have them engage. How can
you check slack adjusters? Use gloves and pull hard on the slack adjuster, if the slack
adjuster moves more than an inch, it needs adjusting. How can you test the low
pressure warning signal? Shut the engine off when you have enough air pressure so
that the low pressure warning signal is not on. Turn the electrical power on and step
on and off the brake pedal to reduce air tank pressure. The low air pressure warning
signal must come on before the pressure drops to less than 60 psi in the tank (or tank
with the lowest air pressure, in dual air systems). How can you check that the spring
brakes come on automatically? Continue to fan off the air pressure by stepping on
and off the brake pedal to reduce tank pressure. The tractor protection valve and
parking brake valve should close (pop out) on a tractor-trailer combination and single
vehicle types when the air pressure falls to the manufacturer's specification (20-40
psi). This will cause the spring brakes to come on. What are the maximum leakage
rates? 2 psi in a minute for single vehicles and 3 psi in a minute for combination
vehicles. When applying 90 or more psi to the brakes the loss should be 3 psi per
minute in single vehicles and 4 psi for combination vehicles in a minute.
